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RFC 4867, "RTP Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs", April 2007

Source of RFC: avt (rai)
See Also: RFC 4867w/ inline errata

Errata ID: 4348
Status: Verified
Type: Technical
Publication Format(s) : TEXT

Reported By: Thomas Belling
Date Reported: 2015-04-27
Verifier Name: Ben Campbell
Date Verified: 2016-05-25

Section 4.3.1 says:

   The encoder SHOULD follow a received codec mode request, but MAY
   change to a lower-numbered mode if it so chooses, for example, to
   control congestion.

It should say:

   The encoder MUST follow a received codec mode request as soon as
   possible. It SHOULD use the requested mode, but MAY change to a
   lower-numbered mode if it so chooses, for example, to
   control congestion. However, the encoder MUST NOT use a
   higher-numbered mode than the received codec mode request.

Notes:

This seems to be the intention of the existing text, but is not explicitly stated. It is essential for the end-to-end mode control and interoperability with 3GPP CS networks that a peer does not send higher modes than requested.

This erratum has been discussed and endorsed by the 3GPP SA4 group before submission to IETF.

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